Ridge push is caused by the potential energy gradient from the high topography of the ridges. Slab pull is caused by the negative buoyancy of the subducting plate.
The main difference between ridge push and slab pull is that the ridge push occurs due to potential energy gradient that arises from the tall topographies of the ridges whereas the slab pull occurs due to the negative buoyancy arising in the subducting plate
Each unit of decrease has an exponential increase. So if you are looking at an item that has a Ph of 4 and water has a Ph of 7 —-that means it is 10 to the 3rd power more acidic or 1000 times more acidic than water.
To be honest, both resources are really good! If i were you i would go to the library for information. If you don't want to go anywhere than online is best.
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Im really sorry if my opinion wasn't what you needed.
